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GE Double Oven Microwave not heating

GE Microwave no heat

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6 replies to this topic

#1 bluefrog

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Posted 28 November 2012 - 01:47 PM

Hi all, I wanted to run this by some of you experts since my knowledge of microwaves is limited.  I have a double oven microwave that runs fine but no heat.  I removed the microwave unit from the oven and brought to shop for diagnose.  So far I have checked all fuses and the capacitor and they check fine.

 

Tested diode and it drops to 6V on a 9volt battery and reads mV when reversed. 

 

I tested the magnetron terminals and they both had resistance of less than 1 ohm, also checked from terminal to mag body and showed infinity.  It looks as though the magnetron is ok.  Is this a foolproof test?

 

I didn't really know how to test the transformer and I can't power the unit on without it installed in the double oven.

 

Any thoughts out there?

 

Thanks,

Nick

 

 

 

 


Thanks,

Nick

 

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#2 Cactus Bob

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Posted 28 November 2012 - 02:25 PM

The ohms test is no way to test a magntron , all your testing is the filament , and most bad magntrons have good filaments 

 

i always thought the ohms test was stupid , but i guess it's the only way to test the thing

 

my rule of thumb : check everything else , if it's all good and you still have no heat , replace the magntron . i have been right 100% of the time

 

I am lucky , i have a bunch of used "test" magntrons , to just switch it out and see what happens

 

just so you know , magntrons are all wired the same inside , as long as you can mount the mag even if it's just 2 screws , you can use it to test for heat .  just use your head and be sure to mount it with a good seal and don't leave an incorrect one on for more that a few mins while testing


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#3 RegUS_PatOff

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Posted 28 November 2012 - 02:29 PM

and the the original problem was no heat ?

(not a blown Fuse) ?


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#4 bluefrog

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Posted 28 November 2012 - 04:33 PM

Thanks for the reply!  

 

Yes original problem was no heat, and I the ceramic and thermal fuses check out ok.


Thanks,

Nick

 

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bluefrogappliance@gmail.com

 


#5 jumptrout

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Posted 28 November 2012 - 04:49 PM

Why can't you make a test cord to power the M/W?



#6 Samurai Appliance Repair Man

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Posted 29 November 2012 - 09:41 AM

The ohms test is no way to test a magntron , all your testing is the filament , and most bad magntrons have good filaments 

 

Check out the Willie Method™ for testing a magnetron ==> http://appliantology...magnetron-tube/



#7 Chat_in_FL

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Posted 01 December 2012 - 05:44 AM

Why can't you make a test cord to power the M/W?

No model number here, but a test cord to the primary side of x-fmr to by-pass door switches, relays, etc...  and if your diode and cap check out OK, narrows it down to the mag if no heat.


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Recent blog entries on this topic

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Using a Test Cord to Diagnose a Microwave

By Samurai Appliance Repair Man in Samurai Appliance Repair Man's Blog, on 01 December 2012 - 07:21 AM

A powerful troubleshooting technique when working on microwave oven that won't heat is to split the problem in half to determine if the problem is coming form the low voltage side or the high voltage side.  A test cord can be a very useful troubleshooting tool because it allows you to so just that.  Sublime Master Chat_In_RI  enlightens us on this techniq...

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